Card I designed to give out at World Maker Faire NY 2014. I experimented with engraving the text so there is only a single layer of plastic underneath the letters. The text is read by holding the card up to the light to show my Twitter username and the event. Card doubles as a MAKER stencil. The folks @lumi used the card to create a fabric print. In the photo you can see that the stenciled MAKER letters are dark blue while the other text is a lighter blue. Sized to match a credit card, it fits easily in a wallet.
Experiment with this design in Tinkercad. Edit it online https://www.tinkercad.com/things/6jAhOLecvSL